Safety device of the elevator door

Abstract

A safety device for an elevator door characterized by the following facts: a lever ( 2 ) with one end ( 3 ) pivoted at an elevator door safety shoe ( 1 ) has its other end ( 4 ) fixed and supported on each floor in a rotatable manner; a polarized reflection plate ( 11 ) is supported at one end of a link lever ( 8 ) which has its other end pivoted to the aforementioned lever ( 5 ) to swing around a pivot point ( 9 ); a detector ( 12 ) facing the polarized reflection plate ( 11 ) is connected to a controller ( 15 ); and the controller is connected to the door operator ( 16 ).

We claim:  
     
       1. A safety device for an elevator door characterized by the following facts: a shoe lever with one end pivoted at an elevator door safety shoe and having its other end fixed and supported on each floor in a pivotable manner; a polarized reflection plate, supported at one end of a link lever and having its other end pivoted to the aforementioned shoe lever to swing around an intermediate pivot point; a detector facing the polarized reflection plate connected to a controller; and the controller being connected to the door operator. 
     
     
       2. The safety device of elevator door noted in  claim 1 , in which the detector has an LED as a light emitting element which is opposite an X-axis polarization filter and a photo diode as a light receiving element which is opposite a Y-axis polarization filter.